Alex Kofman wrote: By the way, It seems you have an exception when SingleOrDefault() is executed, but not in subscriptionTopic.Events.Add(topicEvent). I.e. transaction is just not open when you call FiringEvent method.

Denis Krjuchkov, the guy responsible for this, found that you're using ~ v4.0.5 by stack trace - so most likely, the issue is already fixed in the latest nightly build. I'm going to publish v4.1 RC2 during next few days, so just download and install it.

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